Electrical centre

From International Dictionary of Marine Aids to Navigation
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Electrical centre (of a ship)

The reference point on the vessel which is determined for each individual navigational system.

It is used to measure distance and is determined by calibration at a known range on a number of different headings.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM